Subband hyperstable adaptive IIR filters

Two subband implementations of hyperstability based adaptive infinite-impulse response (IIR) filtering algorithms are presented. These schemes are based on the polyphase decomposition of the adaptive filter and do not require cross filters to avoid aliasing. With this configuration, the larger the number of subbands, the more likely the SPR condition that this class of algorithms requires for convergence is to be satisfied. In addition, it is possible to assign different weights and/or compensating filters across the subbands, thus providing the designer with additional flexibility.